/************************************************************************
 *   insanemap GIMP plugin
 *
 *   Copyright (C) 2002-2008 Shawn Kirst <skirst@insightbb.com>
 *   Copyright (C) 2013 Omar Emad
 *   Copyright (C) 2013 Derby Russell <jdrussell51@gmail.com>
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public
 *   License as published by the Free Software Foundation; either
 *   version 2 of the License, or (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *   General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; see the file COPYING.  If not, write to
 *   the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 *   Boston, MA 02111-1307, USA.
 ************************************************************************/

#ifndef SCALE_HEADER_GUARD
#define SCALE_HEADER_GUARD

void scale_pixels(unsigned char *dst, int dw, int dh,
                  unsigned char *src, int sw, int sh,
                  int bpp);

static inline int icerp(int a, int b, int c, int d, int x) __attribute__((always_inline));

static inline int icerp(int a, int b, int c, int d, int x)
{
   int p = (d - c) - (a - b);
   int q = (a - b) - p;
   int r = c - a;
   return((x * (x * (x * p + (q << 7)) + (r << 14)) + (b << 21)) >> 21);
}

#endif /** SCALE_HEADER_GUARD */
